NUMERICAL STUDY OF SURFACE ACOUSTIC WAVE PROPERTIES IN YBa3(PO4)3 CRYSTAL

10.25712/ASTU.1811-1416.2022.02.004

Abstract

New piezoelectric materials are increasingly in demand for use in various kinds of devices (sensors, etc.) operating in a wide range of temperatures. The technology of surface acoustic waves (SAW) allows one to carry out joint signal processing from multifunctional sensor elements. A new YBa₃(PO₄)₃ crystal has cubic symmetry and possesses piezoelectric properties. The paper presents a numerical study of the surface acoustic wave properties in a new piezoelectric orthophosphate YBa₃(PO₄)₃ crystal. The SAW phase velocity, electromechanical coupling coefficient and power flow deflection angle are studied for different crystal cuts of YBa₃(PO₄)₃. It is shown that SAW has the maximum value of electromechanical coupling coefficient (0.17%) on the Z-cut and wave propagation direction along the X+45°-axis of the crystal. For the Z+45°-cut and wave propagation direction along the X-axis of crystal, the SAW piezoelectric coupling coefficient is equal to 0.1%. These two cuts of the crystal are potentially useful for SAW device applications.